Indoor Localization Using Bluetooth Low Energy And Visible Light Communication

High-precision Location Based Service(LBS)is one of the hot spots in the development of the Internet of Things.Location is an important basis for human behavior,and about 80% of human activities are carried out indoors.Therefore,as long as the indoor location can be successfully combined with user data or information of interest to the user,indoor positioning technology and related services must have a very broad development prospect.Indoor positioning will become an important entry point in the mobile Internet era,because about 80% of mobile devices and data connections are used indoors.Any object in the real world can be reflected in the virtual world in a time-and-place manner,so high-precision positioning technology is one of the key technologies to make virtual reality successful.However,in order to achieve high-precision positioning by using single positioning system is difficult,which requires an extremely high cost.Aiming at the shortcomings of single positioning technology,this paper proposes a fusion indoor positioning scheme based on low-power Bluetooth(BLE)and visible light communication(VLC).Firstly,this paper elaborates the principle of BLE indoor positioning and simulates the signal distribution of BLE antenna.Several optimization methods for BLE signal interference are proposed.Secondly,for the optimized BLE indoor positioning scheme,the accuracy of some positioning algorithms are compared,including trilateral positioning algorithm,MDS positioning algorithm and KNN-based fingerprint localization algorithm.Thirdly,the principle of VLC indoor positioning is elaborated.An optimized trilateral positioning algorithm based on Lambert model parameter estimation is proposed for VLC indoor positioning scheme,which reduces the computational complexity and improves the positioning accuracy.Since the BLE positioning accuracy is low and the VLC positioning is susceptible to occlusion,it is considered to combine the two positioning techniques.The BLE positioning system can compensate for the defects of visible light in the VLC positioning system,and the VLC positioning system can also compensate for the low positioning accuracy of the BLE positioning system.According to the technical solutions of the two positioning systems,an experimental verification system was built and a series of experimental tests were carried out.The performance and accuracy of the actual system positioning process were tested which was carried out in different indoor enviroments.From this,the positioning method suitable for fusion positioning was selected and a set of useful positioning program was summarized.